The HI-720 Calcium Hardness Checker is a simple, accurate and cost effective way to measure low ranges of calcium in water.

Designed as a more accurate alternative to chemical test kits, the HI-720 provides quick, accurate results in four easy steps.

HI-720 uses an adaptation of the standard methods for the Examination of Water and Wastewater, 18th edition, Calmagite method. The reaction between calcium and the reagents cause a reddish-violet tint in the sample.

Ideal for

• Water purification systems
• Heating and cooling systems
• Drinking water
• Plating
• Wastewater

Key features

• Small palm-sized design
• Accurate from ± 0.20 ppm ±5% of reading
• Dedicated to a single parameter
• Auto power off after 10 minutes of inactivity
• Built-in timer for timed reaction readings

Order Information

The HI-720 Calcium Hardness Checker is supplied with sample cuvettes with caps (2), calcium hardness reagent starter kit x 25 (re-ordering information HI-720-25 x 25 tests), syringes with tips (2), plastic beaker, battery, instructions and quick start guide.

Also available: Calibration set HI-720-11.

Four steps. One click. Instant Readout.

  1. ‘Zero’ the Checker®HC with your vial & water sample inside

  2. Take the vial out and add your reagent

  3. Place your vial into your Checker®HC

  4. Press the button and read the results

Use reagents HI-720-25 for HI-720 Calcium Hardness Handheld Colorimeter -Checker®HC x 25 tests

Use Calibration Set HI-720-11 for HI-720 Calcium Hardness Colorimeter - Checker®HC